I am considering buying a tablet for note taking at university. The tablet will be used as my secondary computing device - I have a laptop that I use extensively.I have a limited budget, so getting the very best isn't necessarily an option.

The main requirement I have is that the tablet must have an active digitizer. I want to use the tablet to take class notes and annotations to pdf's, some with about 10-30 pages and other of at least 500-1800 pages each. If the tablet has consistent slow loading times, laggy pen input, unresponsiveness, etc. causing me to fall behind on my notes, it will obviously not be used.Other than that, I do not have any preferences for operating system and other specs. I just want the best possible tablet with the best possible performance within a reasonable price range.

Could you please give me some options of which tablets to consider and from those, which one you would have taken?